KR100905033B1 - Tape-shaped molded parts and belts for ball chains - Google Patents

Abstract

A tape-shaped product and a belt for ball chain are provided. A tape-shaped product of synthetic resin including a tape of a thermoplastic resin, and a preliminarily stretched fibrous member of a thermoplastic resin contained therein along longitudinally parallel edges or in proximity thereto of the tape; and a belt for ball chain, including a tape-shaped product of synthetic resin formed by injection molding together with a fibrous member as an insert of a resin of the same kind as the fibrous member so that the fibrous member is disposed along the longitudinal edges or in proximity thereto, ball-insetting holes disposed at equal intervals, and ball-retaining projections disposed around the holes. <IMAGE>

Description

Tape-shaped molded parts and belts for ball chains {TAPE-SHAPED MOLDING AND BELT FOR BALL CHAIN}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt for a ball chain to be used in a linear motion guide device on a track by using a rotation of a rolling member such as a tape-shaped molded article and a plurality of balls or rollers (hereinafter typically referred to as "ball").

Conventionally, there are many thermoplastic tape-shaped moldings, but there are few proposals for tape-shaped moldings suitable for forming a belt in which a plurality of holes are provided in the tape-shaped flat portion and other objects are held in the holes. As the belt for providing a plurality of holes in the tape-shaped plane portion and holding other objects therein, for example, there is an endless belt for freely holding the ball in the linear motion guide on the track. Such a belt connects between a ball holding part interposed between a plurality of balls arranged in a row at predetermined intervals, and each ball holding part, as described in, for example, Japanese Patent Laid-Open No. 5-52217. It consists of a flexible connecting member.

In the production of such a ball chain belt, there are a method in which a predetermined ball retaining hole is provided in an extruded tape-shaped molded product and a method by direct injection molding without going through a tape-shaped molded product. One example of the former is, as described in Japanese Patent Laid-Open No. 2001-74048, extrusion-molding a flat tape-shaped long tape-shaped molding (belt member) in advance, and cutting the belt member to a predetermined length to produce a ball. A spacer portion for holding the balls between the adjacent holding holes is injection molded while the holding holes to be inserted are drilled in a row, and the balls are used as the middle element in the holding holes. In this way, after molding the tape-shaped molding (belt member) by extruding the synthetic resin, it is difficult to obtain a sufficient strength suitable for use in sliding this as an endless belt when a ball holding hole is provided to hold the ball freely rotating. In addition, adhesion between the spacer portion molded by injection molding and the belt member is insufficient, resulting in dropping of the spacer portion. Therefore, Japanese Laid-Open Patent Publication No. 2001-74048 also uses resins to coat the reinforcing material and the resin to form the tape portion by using two extruders to secure the tensile strength and the bending strength to the belt member. The extrusion method or the extrusion molding method which embeds reinforcement materials, such as glass fiber, carbon fiber, ceramic fiber, in both ends parallel to the longitudinal direction of a flat belt belt is also disclosed. However, even when the reinforcing material portion is formed by co-extrusion of the two kinds of resins described above, sufficient tensile strength cannot be obtained. When the draw ratio is increased to increase the strength, the thermal contraction rate increases, for example, in a linear motion guide device. It is not suitable for use such as an endless belt that keeps the ball free to rotate. In addition, the belt-forming material such as glass fiber, carbon fiber, ceramic fiber and the like made of a heterogeneous material cannot be sufficiently firmly combined with the belt-forming material, and are likely to have a gap between them due to various loads in use. If a gap is formed, the strength may drop rapidly, which causes a problem in durability.

In addition, another method of manufacturing a belt for a ball chain is, for example, the method described in Japanese Patent Application Laid-Open No. 11-247856, which is larger than the diameter of a ball used for a ball chain in a mold for injection molding of synthetic resin. By arranging the ball shape of the diameter so as to protrude at predetermined intervals and injecting synthetic resin into the mold, the connecting belt in which the ball shape is arranged is formed, and after removing the connecting body from the mold, the predetermined ball is pushed into the ball shape of the molded body. It is a method to keep a ball rotatable by putting it. In this way, it is very difficult to express sufficient dimensional accuracy, for example, even if sufficient precision is obtained, not only the manufacturing cost of the mold is very expensive, but also it is difficult to remove the product from the mold and burrs are formed around the hole. The incidence of defective products is high, which is undesirable.

Another method, for example, the method disclosed in Japanese Patent Laid-Open No. 5-196037, has a connection between a ball piece to be sandwiched between a plurality of balls and each ball piece, and a ball hole into which a ball is inserted. The band is integrally molded by injection molding. In injection molding, the resin injected from each gate is joined at an intermediate portion between the gates. Bonding of this resin is called weld, and this part is easy to fall in strength.

As described above, there is no tape-shaped molded article suitable for forming a belt in which a plurality of holes are provided in the tape-shaped plane to hold other objects. Moreover, manufacture of the belt member by the method as mentioned above is complicated, and desired strength is hard to be obtained.

The present inventors have provided a tape-shaped planar portion with a plurality of holes, and a tensile strength arranged so as to freely rotate a tape-shaped molded article or a ball with a large tensile strength suitable for forming a belt for holding other objects in the hole. In order to obtain a molded article having a high tensile strength as a belt for a large ball chain, the present invention has been studied.

INDUSTRIAL APPLICABILITY The present invention provides a tape-shaped molded product suitable for molding a belt provided with a plurality of holes in a tape-shaped flat portion or a belt for retaining other objects in the hole, and a ball chain belt having excellent ball holding force and durability. The task is to provide.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin tape-shaped molded article formed by embedding a fibrous material of a thermoplastic resin (hereinafter, referred to as an oriented fibrous product) previously stretched at both ends parallel to the longitudinal direction or a portion thereof. Preferably, the stretched fibrous material is made of a synthetic resin which can be molded with a resin other than the fibrous material constituting the tape-shaped molded article, has a longitudinal tensile strength of 250 MPa or more and a heat shrinkage ratio of 1% or less, preferably Is a synthetic resin tape-shaped molding characterized in that the longitudinal tensile strength is 300MPa or more and the heat shrinkage is 0.5% or less.

In addition, the present invention is a synthetic resin tape-shaped molded article formed by inserting a stretched fibrous material and injection molding a thermoplastic resin having good adhesion with the stretched fibrous material, wherein the built-in stretching is located at both ends parallel to the longitudinal direction or a portion thereof. Ball chain belt formed by installing a fibrous material, a ball insertion hole provided in a straight line at equal intervals, and a ball holding member on both sides of the hole (even if it is not held, the adjacent balls can be prevented from directly contacting each other). It is about. The belt for belt chain of the present invention is made of a synthetic resin having good adhesiveness which can be molded with a resin other than the fibrous material of which the stretched fiber shape constitutes the belt, and when the ball is inserted into the ball insertion hole with a tensile strength of 100 MPa or more. Ball holding force of 30MPa or more, heat shrinkage is less than 1%. Preferably, the tensile strength is 150 PMa or more, the ball holding force when the ball is inserted into the ball insertion hole is 45 MPa or more, and the thermal contraction rate is 0.5% or less. In such a case, it is preferable that the stretched fiber shape is in the outer portion than the insertion hole.

1 is a perspective view showing a tape-shaped molded article of the present invention.

Fig. 2 shows the belt for a ball chain of the present invention, (a) is a plan view, (b) is a longitudinal side view, and (c) is a lateral side view.

Fig. 3 is a view showing a state where a stretched fiber-like article is set in a molding die of a tape-shaped molded article of the present invention, where (a) is a longitudinal cross-sectional view and (b) is a cross-sectional view.

4 is a perspective view showing a tape-shaped molded article that does not contain a stretched fiber-like article for comparison.

5 shows a coextruded composite tape shaped article comprising a shim for comparison.

Fig. 6 shows a view in which a ball insertion hole is drilled into the tape-shaped molded article of the present invention.

Fig. 7 shows a drawing in which a drawn fiber-like article and a ball are set in a mold for forming a belt for a ball chain of the present invention.

Fig. 8 shows a ball chain belt (no stretched fiber shape) for comparison, (a) is a plan view, and (b) is a side view.

Fig. 9 shows a ball chain belt (composite belt including a shim) for comparison, (a) is a plan view, (b) is a longitudinal side view, and (c) is a lateral side view.

FIG. 10 is a view in which a ball insertion hole is drilled into a tape-shaped molded article not containing stretched fiber-like article for comparison.

Fig. 11 is a diagram in which a roller is set in a mold for forming a belt for a roller ball chain of the present invention.

12 is a diagram of a belt for a roller ball chain of the present invention, (a) is a plan view, (b) is a longitudinal side view, and (c) is a lateral side view.

Figure 13 is a perspective view showing a linear motion guide device incorporating the ball chain of the present invention.

14 is a perspective view showing a linear motion guide device incorporating a roller-type ball chain of the present invention.

Fig. 15 is a sectional view showing a ball screw incorporating the ball chain of the present invention.

Explanation of References

1: Stretched Fiber Shape 2: Tape Shape

3: ball holding hole 4: ball holding member

5: molding ball 6: core

7: inserted ball 8: mold

9: roller holding hole 10: roller holding member

11: linear motion guide device 12: track rail

13: moving block body 14: ball chain

15: linear motion guide device 16: track rail

17: moving block body 18: roller-type ball chain

19: ball screw 20: screw shaft

21: nut member 22: return pipe

23: Ball chain (ball belt and ball)

The tape-shaped molded article of the first invention is a molded article as shown in Fig. 1, which consists of a stretched fiber shaped article 1 and a resin 2 to be inserted, and the stretched fiber shaped article 1 is formed in the mold in the longitudinal direction. The tape-shaped portion (injection molding number) integrated with the stretched fiber-like article 1 by injection molding of the stretchable fiber-like article 1 and the moldable adhesive resin, which is set to be embedded at both ends parallel to or near the portion thereof. (2) to form a resin tape-shaped molded article having a longitudinal tensile strength of 250 MPa or more and a thermal shrinkage of 1% or less, preferably of a longitudinal tensile strength of 300 MPa or more and a thermal shrinkage of 0.5% or less. In addition, the heat shrinkage was measured after leaving for 24 hours in a state without tension in 40 degreeC (dry heat).                 

The ball chain belt of the second invention has both ends parallel to the longitudinal direction of the tape-shaped molding, as shown in Fig. 2 (a): top view, (b): longitudinal side view, (c): transverse side view). Or a plurality of ball insertion holes 3 at equal intervals in the center of the tape-like portion (injection molding resin) 2, the ball-shape between the insertion hole and the insertion hole in a portion close to it. It consists of the dragon member 4. In such a case, it is preferable that the stretched fiber shape is in the outer portion than the insertion hole. 2, the broken line 7 shows a state where the ball is sandwiched.

The belt for a ball chain of this invention mentioned above can be manufactured as follows. That is, in the tape-shaped molded article (FIG. 1) containing the stretched fibrous product manufactured as described above, as shown in FIG. 6, the hole 3 having a diameter slightly larger than the ball (or roller) to be held. The hole is processed at equal intervals, the molding ball is inserted into this hole 3, and the ball holding member 4 is injection molded in the shape of a protrusion around the hole. Alternatively, as shown in FIG. 7, the molding balls 5 and the stretched fibrous material 1 having a diameter slightly larger than the retaining balls are arranged in the mold 8 without passing through the tape-shaped molded article. The tape-shaped portion 2 and the holding portion 4 are integrally formed by injection molding of the resin. In this way, a stretched fiber-like material is incorporated at both ends parallel to the longitudinal direction or a portion thereof, to obtain a molded article having a fixed ball central portion, and a molding ball can be removed to obtain a ball chain belt. The manufacture of the ball chain using this can be made into the ball chain which hold | maintains a ball so that it may rotate freely by inserting the predetermined ball to hold | maintain in each hole.                 

Here, the fibrous material of the thermoplastic resin previously stretched refers to the fibrous material in which the molecular chain is oriented by spinning the unstretched fibrous material and then stretching the unstretched fibrous material. The extending | stretching method is not specifically limited, What is necessary is just to be able to raise the orientation of a fibrous thing. For example, the method of performing a extending process continuously from unstretched may be sufficient, and also after extending | stretching an unstretched fibrous form, the method of extending | stretching by a separate process may be sufficient. The stretching may be performed in a single stage or in a multistage stage of two or more stages, or may be subjected to a process such as heat treatment. The stretching medium may be a gas, a liquid or a hot plate, and is not particularly limited. Moreover, the method of performing direct radiation drawing which drafts the resin discharged from the spinneret is also good. As the fibrous material of the previously stretched thermoplastic resin, a monofilament or a multifilament may be used as a stretched fiber having a tensile strength of 300 MPa or more, preferably 450 to 1000 MPa, obtained by stretching under general stretching conditions. The composite structure fibers (for example, the sheath structure) may also be composite yarn fibers, twisted yarn fibers, heteromorphic fibers, and the like, and any structure that can maintain adhesion to the injection molded resin with sufficient strength is not limited thereto. no. As the stretched fiber-like article of the thermoplastic resin previously stretched, a monofilament (including an eccentric composite yarn) homogeneous with the resin to be injection molded is preferably used.

Moldable adhesive resins are not only the same, but the main components of the resin may be the same or may be of the same system, and the surface layer of the stretched fibrous material is subjected to chemical and physical treatments and is not easily peeled off practically. It means that there is adhesiveness. The resin used for injection molding is not particularly limited as long as it can be injection molded, but various elastomers (for example, polyester, nylon, polyolefin, acrylic, and fluororesin) or various synthetic resins (for example, For example, polyester type, nylon type, polyolefin type, acryl type, fluorine resin type, etc. can be used.

Specific combinations of the stretched fibrous material and the injection molded resin include, for example, PVDF / PMMA Echo composite yarns, acrylic elastomers, polyester elastomers, PBT elastomers, etc. Elastomers, PMMA-impregnated UHMWPE fiber strings and PMMA.

Further, in the tape-shaped molded product obtained by injection molding from the stretched fiber-like article and the resin having good moldability, the ratio of the stretched fiber-shaped article in the cross section perpendicular to the longitudinal direction is 10 to 70%, preferably 20 to 60% is preferable. This ratio can be changed depending on the size of the tape-shaped molding, the desired strength, and the like.

In the tape-shaped molded article of the present invention, the orientation of the molded parts other than the fibrous articles is lower than the fibrous articles, and the heat shrinkage ratio of the tape-shaped molded articles is preferably 1% or less, and more preferably 0.5% or less.

The tape-shaped molded article of the present invention is not limited to the shape of the cross section orthogonal to the longitudinal direction being quadrilateral, but is a triangular, polygonal or one side or a plurality of side curves, an ellipse or an ellipse divided into two. And the like.

Moreover, in the tape-shaped molded article of the present invention, the ratio between the maximum thickness and the width in the cross section is 1:50 to 1: 1, preferably 1:20 to 1: 1, more preferably 1:15 to It is in the range of 1: 2. Especially preferably, it is a molded article which forms a rectangle whose ratio of the maximum thickness and width in said cross section is 1: 15-1: 2.

A ball chain formed by joining a ball to a tape-shaped molded article of the present invention is a linear motion guide device provided with an endless circulation path such as a ball, and a ball connecting body of, for example, a ball screw device described in JP-A-11-37246. It can be used suitably as.

Hereinafter, an Example and a comparative example are given and this invention is demonstrated in detail.

In addition, the measurement conditions of the thermal contraction rate, tensile strength, and elongation in the following example and a comparative example are as follows.

[Measurement Method and Measurement Conditions]

① Heat shrink rate:

   It measured by temperature: 40 degreeC (dry heat), and time: 24 hours.

② Method of measuring tensile strength and elongation:

  Under the environment of a temperature of 23 ° C., a test piece having a length of 50 mm was measured at a tensile speed of 50 mm / min using Tenshiron UCT = 100 (manufactured by Orien Tech Co., Ltd.).

③ Ball holding part strength of ball chain belt:

  The ball was inserted into the third hole from the end of the belt for the ball chain, and the ball was inserted and measured in the same manner as the tensile strength.

The belt for the ball chain has round holes in the belt, and the cross section is different depending on each part, but the break occurs at the smallest cross section. The ball holding part strength was calculated from the minimum cross-sectional area.

In addition, the physical properties of the products prepared in each example and each comparative example are summarized in Table 1 and Table 2.

(Example 1)

The polyester elastomer of MFR10 was spun at a resin temperature of 240 ° C. with an extruder of 50 mm Φ to obtain an undrawn yarn. This undrawn yarn was stretched 5.8 times in a hot air bath at 150 ° C., and then relaxed 10% in a hot air bath at 180 ° C. to obtain a 200 μm drawn yarn. The tensile strength of this stretched yarn was 470 MPa, and the elongation was 86%.

Next, this stretched yarn is set in the injection molding mold as shown in Fig. 3, and the same resin as the stretched yarn is inserted into the mold at 280 ° C, and the tape shape shown in Fig. 1 having a width of 0.65 mm and a thickness of 0.24 mm is shown. A molded article was obtained. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. As shown in Table 1, this molded article has high tensile strength, low thermal shrinkage, and good dimensional stability. Good adhesion and no exfoliation of drawn yarn.

(Comparative Example 1)

Comparative Example 1-①

A tape-shaped molded article shown in Fig. 4 having a width of 0.65 mm and a thickness of 0.24 mm was obtained in the same manner as in Example 1 except that the same resin as in Example 1 was used and no stretched yarn was set. Its tensile strength is 61 MPa, which is very small compared with the molded article of Example 1.

Comparative Example 1-②

The polyester elastomer of MFR10 was spun at a resin temperature of 240 ° C. with an extruder of 50 mmφ to obtain an undrawn yarn of 200 μm. Next, as in Example 1, this non-drawn yarn is set in the injection molding die as shown in Fig. 3, and the same resin as the undrawn yarn is inserted into the die, and shown in Fig. 1 having a width of 0.65 mm and a thickness of 0.24 mm. The illustrated tape-shaped molded article was obtained. Its tensile strength is 65 MPa, which is very small compared with the molded article of Example 1.

From these comparative examples, it is possible to understand the effectiveness of embedding the stretched fiber-like article in Example 1.

(Comparative Example 2)

Unlike the molded article of Example 1, a tape-shaped molded article containing no stretched fiber-like article was prepared by extrusion molding.

2- 1: Instead of the injection molding of Example 1, a tape-shaped molded product shown in FIG. 4 was obtained using an extruder of 50 mmφ.

2-②: The tape-shaped molded product was extruded in the same manner as in the above-mentioned 2-①, and then stretched by 5.8 times in a hot air bath at 150 ° C., and then relaxed by 10% in a hot air bath at 180 ° C. to tape shape shown in FIG. 4. A molded article was obtained.

2-③: After extruding the tape-shaped molded article in the same manner as in the above-mentioned 2-①, stretching it in 6.25 times in a hot air bath at 180 ° C., and then relaxing 30% in a hot air bath at 220 ° C. to tape shape shown in FIG. 4. A molded article was obtained.

2-④: A tape-shaped molded article shown in Fig. 4 was obtained in the same manner as in 2-② except that the draw ratio was increased to 6.9 times.                 

From these 2-① to 2-④, the tape-shaped molded article by extrusion molding containing no stretched yarn has a low tensile strength. Extruded articles also undergo a drawing process to increase their tensile strength, but a draw ratio of a large increase in thermal shrinkage of the molded article is undesirable. In any case, sufficient strength could not be obtained as compared with the molded article of Example 1.

(Example 2)

A core-shaped composite yarn (core / second ratio = 80/20% by volume) with a polyester elastomer of MFR10 as the core and a polyester elastomer of MFR17 as a core was spun at a resin temperature of 240 ° C. to obtain an unstretched yarn. This undrawn yarn was stretched 5.8 times in a hot air bath at 150 ° C., and then relaxed 10% in a hot air bath at 180 ° C. to obtain a 200 μm drawn yarn. The tensile strength of this stretched yarn was 437 MPa, and the elongation was 71%. Using this stretched yarn and the polyester elastomer of MFR10, a tape-shaped molded article having a width of 0.65 mm and a thickness of 0.24 mm shown in Fig. 1 was obtained in the same manner as in Example 1. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. This molded article also showed excellent physical properties as in the molded article obtained in Example (1).

(Comparative Example 3)

A tape-shaped molded article (Fig. 5) having shims 6 corresponding to the stretched yarn in Example 2 was produced by coextrusion.

3-①: Instead of the injection molding of Example 2, the polyester elastomer of MFR10 was co-extruded with the polyester elastomer of MFR17 so as to form a shim having a diameter of 0.2 mm at both ends of the molding tape, and is shown in FIG. A tape-shaped molded article (width 0.65 mm, thickness 0.24 mm, core diameter 0.2 mm) containing a shim 6 was prepared.

3-②: The tape-shaped molded article including the core co-extruded in the same manner as in 3-① was subsequently stretched 5.8 times in a hot air bath at 150 ° C., and further relaxed by 10% in a hot air bath at 180 ° C. A stretched tape-shaped molded article (width 0.65 mm, thickness 0.24 mm, wick diameter 0.2 mm) including the illustrated shim was manufactured.

3-③: After stretching the tape-shaped molded article including the shim extruded in the same manner as 3-② by 6.25 times in a hot air bath at 180 ° C., and further relaxing 30% in a hot air bath at 220 ° C. as shown in FIG. 5. The stretched tape-shaped molded article (width 0.65 mm, thickness 0.24 mm, core diameter 0.2 mm) containing the cores was prepared.

3-④: A tape-shaped molded article (width 0.65 mm, thickness 0.24 mm, wick diameter 0.2 mm) including the core shown in Fig. 5 by co-extrusion, except that the draw ratio was increased to 6.7 times. Was prepared.

In these 3-① to 3-④, after obtaining a tape-shaped molded product in which resin forming a seam is formed at both ends by extrusion molding, the stretched tape-shaped molded article including the drawn seam is injection molded using a stretched yarn. In comparison with the above, sufficient strength cannot be obtained, and in order to increase the strength, increasing the draw ratio increases the heat shrinkage rate, and it can be seen that the thread and the tape portion are easily peeled off.

(Example 3)

A 6/66 copolymerized nylon resin having a relative viscosity of 3.5 was spun at a resin temperature of 230 ° C. with an extruder of 50 mmφ to obtain an undrawn yarn. The unstretched yarn was stretched 3.6 times in a single step in a hot water bath at 85 ° C, then stretched in two steps at 1.5 times in a hot air bath at 185 ° C, and further relaxed 15% in a hot air bath at 165 ° C to obtain a 200 µm stretched yarn. The tensile strength of the drawn yarn was 815 MPa, and the elongation was 45%. Next, as in Example 1, this stretched yarn is set in the injection molding mold as shown in Fig. 3, and the same resin as the stretched yarn is inserted into the mold and injection molded at 240 DEG C to show the tape shown in Fig. A shaped molded article was obtained. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. This molded article had a high tensile strength of 581 MPa and a heat shrinkage rate of 0.3%, showing excellent physical properties.

(Example 4)

Polyvinylidene fluoride resin (KF # 1000, manufactured by Kureha Chemical Co., Ltd.) having a? _inh = 1.0 was spun at a resin temperature of 260 DEG C with an extruder having a diameter of 50 mm to obtain an undrawn yarn. The unstretched yarn was stretched 5.6 times in one step in a 165 ° C. glycerin bath, then stretched two times in 1.15 times in a 170 ° C. glycerin bath, and further relaxed 10% in a 160 ° C. glycerin bath to obtain a 200 μm stretched yarn. The tensile strength of the drawn yarn was 752MPa and the elongation was 35%. Next, as in Example 1, this stretched yarn was set in an injection molding die, and the same resin as in Example 1 was injection molded at 240 ° C to obtain a tape-shaped molded article shown in FIG. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. This molded article also showed the same excellent physical properties as the molded article obtained in Example 3.

(Example 5)

200 µm of stretched yarn was obtained in the same manner as in Example 3, except that the two-stage stretching ratio was 1.4 times using the same 6/66 copolymerized nylon resin as in Example 3. The tensile strength of this stretched yarn was 761 MPa. Next, as in Example 1, this stretched yarn was set in an injection molding die, and the same resin as in Example 4 was injection molded at 240 ° C to obtain a tape-shaped molded article shown in FIG. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. This molded article also showed excellent physical properties.

Although Example 4 and Example 5 showed excellent physical properties, in these two examples, the physical properties of the tape-shaped molded article of Example 4 were excellent, although the strength of the stretched yarn was almost the same. This is due to the difference in adhesion between the resin of the stretched yarn and the injection molded resin. If the stretched yarn and the injection molded resin have good adhesion, the physical properties of the stretched yarn can be more effectively expressed in the tape-shaped molded article.

(Example 6)

The polyester resin (IV = 1.0) was used to spin at a resin temperature of 275 ° C. with an extruder of 50 mmφ to obtain an undrawn yarn. This undrawn yarn was stretched at a magnification of 5.5 times, followed by 10% relaxation heat treatment to obtain a 200 탆 stretched yarn. The tensile strength of this stretched yarn was 653MPa and the elongation was 38%. Next, using the resin used in Example 1, this stretched yarn was set in an injection molding mold as in Example 1, and the same resin as in Example 1 was injection molded at 280 ° C to form a tape shown in FIG. A molded article was obtained. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 40%. This molded article also showed the same excellent physical properties as the molded article obtained in Example 3.

(Comparative Example 4)

A stretched yarn-containing tape-shaped product was prepared by inserting a stretched yarn and another resin.

4-①: The polyester resin used in Example 6 co-extruded with the polyester elastomer of MFR10 so that the seam of the both ends of a shaping | molding tape might be formed, and the unstretched tape containing a seam was obtained. Thereafter, stretching and relaxation heat treatment were performed as in Example 6 to prepare a stretched tape-shaped molded article (0.65 mm in width, 0.24 mm in thickness, 0.2 mm in diameter) including the seam shown in FIG. As shown in Table 1, the physical properties were sufficiently developed, but the thermal shrinkage was large and the dimensional stability was insufficient.

4-②: Tape-shaped molded article was molded in the same manner as in Example 1, using the stretched yarn of polyvinylidene fluoride resin obtained in the same manner as in Example 4 and the polyester elastomer of MFR10 used in Example 1. The drawn yarn of polyvinylidene fluoride resin melt | dissolved at the time of insert molding.                 

Next, the example of manufacture of the belt for ball chains is demonstrated.

(Example 7)

As shown in Fig. 7, the balls are set in the mold at equal intervals, and the stretched yarn prepared in Example 1 is disposed at positions embedded at both ends parallel to the longitudinal direction of the molding, and the same resin as the stretched yarn (MFR10 Polyester elastomer) was inserted into the mold to obtain a ball chain belt shown in Fig. 2 having a width of 2.24 mm, a thickness of 0.24 mm, a hole diameter of 1.63 mm phi, and a hole and hole pitch of 1.73 mm. The percentage of drawn yarn in the cross section orthogonal to the longitudinal direction was 5% in the ball holding portion (spacer portion) and 43% in the diameter of the hole. As shown in Table 2, this ball chain belt has high tensile strength, high strength of a ball holding portion, low thermal contraction rate and good dimensional stability. The yarn has no peeling and good adhesion.

(Comparative Example 5)

Unlike the seventh embodiment, except that no stretched yarn is used, the belt for the ball chain shown in Fig. 8 (width 2.24 mm, thickness 0.24 mm, hole diameter 1.63 mm φ, holes) in the same manner as in the seventh embodiment. And hole pitch 1.73 mm) were obtained by injection molding. In FIG. 8, the broken line 7 shows a state where the ball is sandwiched.

(Example 8)

A tape having a width of 2.24 mm and a thickness of 0.24 mm manufactured in the same manner as in Example 1 was subjected to a perforation process (pore diameter 1.63 mm phi, hole pitch 1.73 mm) as shown in FIG. 10. Thereafter, the perforated tape-shaped molded article and the molding ball were sandwiched and set in the mold, and the polyester elastomer of MFR10 was subjected to insert molding to obtain a ball chain belt shown in FIG.

(Comparative Example 6)

The tape for molded ball chains was subjected to perforation processing and insert molding in the tape-shaped molded articles having different draw ratios extruded as in Example 8.

6-①: After extruding a tape-shaped molded article as shown in Fig. 4 having a width of 2.24 mm and a thickness of 0.24 mm with an extruder of 50 mmφ, using the same resin as that of Example 7 (polyester elastomer of MFR10). Similarly, the perforation process (hole diameter 1.63 mm phi, hole pitch 1.73 mm) was performed. Thereafter, the perforated tape-shaped molded article and the molding ball were inserted into the mold, set in the mold, and insert molding was performed to obtain a ball chain belt shown in FIG.

6-②: Using the same resin as in Example 7, extruded the tape-shaped molded article in the same manner as in 6-1, stretched 5.8 times in a hot air bath at 150 ° C., and relaxed 10% in a hot air bath at 180 ° C. , The stretching tape was obtained. Using this tape, punching and insert molding were carried out as in 6-1 to obtain a ball chain belt shown in FIG.

6-③: The belt for ball chains was obtained by the method similar to 6-② except having drawn draw ratio 6.9 times.

6-④: Using the same resin as in Example 7, extruded the tape-shaped molded article in the same manner as in 6-1, stretched 6.25 times in a hot air bath at 180 ° C., and then relaxed 30% in a hot air bath at 22 ° C. And the stretched tape was obtained. Thereafter, punching and insert molding were carried out as in 6-1 to obtain a ball chain belt shown in FIG.

In 6-① to 6-④, when insert molding was performed, molding defects such as insufficient filling of the resin in the spacer portion and "burr" into which the resin entered the hole formed in the hole occurred.

(Example 9)

By using the heart sheath composite yarn obtained in Example 2, a belt for a ball chain shown in Fig. 2 was manufactured by insert molding in the same manner as in Example 7.

(Comparative Example 7)

A belt for a ball chain shown in Fig. 9 was manufactured by using a composite tape including a shim with the polyester elastomer of MFR10 being the core 6 and co-extruded with the polyester elastomer of MFR17. 9, the broken line 7 has shown the state which pinched | interposed.

7-①: The composite elastomer containing the shim (6) was obtained by making the polyester elastomer of MFR10 the core, and co-extruded with the polyester elastomer of MFR17. Using this tape, perforation processing and insert molding were performed in the same manner as in Comparative Example 6 to obtain a ball chain belt of FIG.

7-②: A polyester tape of MFR10 is used as a core and coextruded with a polyester elastomer of MFR17 to obtain a composite tape including a core, and then stretched 5.8 times in a hot air bath at 150 ° C., and further in a hot air bath at 180 ° C. 10% was relaxed and the stretched tape was obtained. Using this tape, punching and insert molding were carried out as in Comparative Example 6 to obtain a ball chain belt shown in FIG.

7-③: The belt for belts shown in Fig. 9 was obtained in the same manner as 7-② except that the draw ratio was increased to 6.7 times in 7-②.

7-④: A core of polyester elastomer of MFR10 and co-extruded with a polyester elastomer of MFR17 to obtain a composite tape containing a core, followed by stretching by 6.25 times in a hot air bath at 180 ° C, and further in a hot air bath at 220 ° C. It relaxed 30% and obtained the stretched tape. Using this tape, punching and insert molding were performed as in Comparative Example 6 to obtain a ball chain belt shown in FIG.

In either case of 7-① to 7-④, molding failure caused a large number of defective molding products, and the molded products obtained normally were not suitable for use because of their small tensile strength and holding part strength.

(Example 10)

The nylon stretched yarn obtained in Example 3 was set in the injection molding mold in the same manner as in Example 7, and the same resin as the stretched yarn was inserted in the mold, and the width 2.24 mm, the thickness 0.24 mm, the hole diameter 1.63 mm phi, The belt for ball chains shown in Fig. 2 having a hole and pitch of 1.73 mm was obtained.

(Example 11)

The stretched yarn of the polyvinylidene fluoride resin obtained in Example 4 was set in the injection molding die in the same manner as in Example 7, and the same resin as the stretched yarn was inserted in the mold to have a width of 2.24 mm, a thickness of 0.24 mm, and a hole. The belt for ball chains shown in Fig. 2 having a diameter of 1.63 mm phi and a hole and pitch of 1.73 mm was obtained.

(Example 12)

The nylon stretched yarn obtained in Example 5 was set in the mold as in Fig. 7 as in Example 7, and the same resin as in Example 4 was injection molded at 240 DEG C, having a width of 2.24 mm, a thickness of 0.24 mm, and a hole diameter of 1.63 mm. And a ball chain belt shown in Fig. 2 having a pitch of 1.73 mm of holes and holes. The ratio of the drawn yarn in the cross section orthogonal to the longitudinal direction was 5% in the retaining portion (spacer portion) and 43% in the hole diameter portion.

Example 11 and Example 12 also obtained excellent physical properties. Example 11 is more excellent because the adhesiveness of the stretched yarn and the injection molded resin is better in Example 11 than in the case of Examples 4 and 5.

(Comparative Example 8)

The stretched yarn of the polyvinylidene fluoride resin obtained in Example 4 was set in the injection molding die in the same manner as in Example 7, and the polyester elastomer of MFR10 was inserted into the mold to have a width of 2.24 mm, a thickness of 0.24 mm, A ball chain belt shown in Fig. 2 having a hole diameter of 1.63 mm phi and a hole pitch of 1.73 mm was manufactured, but polyvinylidene fluoride resin was melted at the time of insert molding.

(Example 13)

The stretched yarn of the polyester obtained in Example 6 was set in the injection molding die in the same manner as in Example 7, and the polyester elastomer of MFR10 was inserted into the mold, and the width was 2.24 mm, the thickness was 0.24 mm, the hole. A belt for a ball chain shown in Fig. 2 having a diameter of 1.63 mm phi and a hole and pitch of 1.73 mm was obtained.

The belts for ball chains obtained in Examples 7 to 13 were sufficiently large in tensile strength and holding part strength, and exhibited excellent performance as ball belt belts.

(Comparative Example 9)

The fiberglass wound on the bobbin (multifilament 9.4μmφ 120 bundles) was fed into the die, the polyester elastomer used in Example 7 was heated to 240 DEG C with an extruder, extruded in the die, and the glass fiber was coated. A composite tape-shaped molded article including a shim was obtained. Subsequently, the punching process and the insert molding were performed as in Comparative Example 6 to obtain a ball chain belt shown in FIG. Insufficient adhesion between the glass fiber and the polyester elastomer caused peeling of the glass fiber or breaking of single yarn.

(Comparative Example 10)

A ball chain belt of FIG. 9 was obtained in the same manner as in Comparative Example 9 except that carbon fibers (multifilament 10 μmφ 80 bundles) were used instead of the glass fibers of Comparative Example 9. Insufficient adhesion between the carbon fibers and the polyester elastomer caused peeling of the carbon fibers or breaking of single yarns.                 

(Example 14)

As shown in Fig. 11, rollers are set in the mold at equal intervals, and the stretched yarn prepared in Example 1 is disposed at positions embedded at both ends parallel to the longitudinal direction of the molding, and the same resin as the stretched yarn (MFR10). Polyester elastomer) into the mold, and the width 2.24mm, the thickness 0.24mm, the hole diameter 1.63mmφ, the hole and the hole pitch 1.72mm are shown in Figs. 12 (a), (b) and (c). The belt for roller type ball chains shown was obtained. The percentage of drawn yarn in the cross section perpendicular to the longitudinal direction was 5% in the ball holding portion (spacer portion) and 43% in the diameter portion of the hole.

This roller-type ball chain belt has high tensile strength, high strength of the portion holding the roller, small thermal contraction rate, and good dimensional stability. The yarn has no peeling and good adhesion.

(Example 15)

A ball chain was formed by inserting a ball into the ball chain belt obtained in the same manner as in Example 7. Using this belt, the linear motion guide device comprised of the track rail 12, the moving block main body 13, and the ball chain shown in FIG. 13 was comprised.

(Example 16)

The ball chain was formed by inserting a ball into the belt for roller type ball chains obtained by the method similar to Example 14. Using this belt, the linear motion guide device 15 composed of the track rail 16, the moving block main body 17, and the roller-type ball chain 18 shown in FIG.                 

(Example 17)

A ball chain was formed by inserting a ball into the ball chain belt obtained in the same manner as in Example 7. Using this belt, the ball screw 19 shown in FIG. 15 was constituted. In the figure, 20 indicates a screw shaft, 21 indicates a nut member, 22 indicates a return pipe, and 23 indicates a ball chain.

Both the linear motion guide device configured in Examples 14 and 15 and the ball screw configured in Example 17 were found to withstand long-term use well, and the belt and ball chain for the ball chain of the present invention is a linear motion guide device or a ball screw device. It has proved to be an excellent absence of.

According to the present invention, in which a stretched fiber-like article is set in a mold and injection molded, a tape-shaped molded article having a high strength which cannot be obtained in a conventional extruded article or simply an injection molded article can be obtained.

In addition, by punching the tape, and by injection molding the rolling element (for example, ball and roller) holding part, a high strength ball chain belt or stretch fiber-like material and a molding ball are set in a mold and injection molded. The obtained ball chain belt is a product of high strength that cannot be obtained from the (co) extrusion molded ball chain belt. Further, by placing the stretched fibrous article at both ends of the molded article, not only the stretched fibrous article itself contributes to the strength but also there is no need to reinforce the weld portion, and the molding defect is remarkably improved.

The ball chain belt is constructed by inserting a predetermined ball (or roller) into the ball chain belt of the present invention obtained as described above. This ball chain belt is used in a linear guide device provided with an endless circulation path, a ball screw, or the like, and can exhibit excellent performance.

Claims (9)

A thermoplastic resin tape-shaped injection molded article, comprising a pre-stretched fibrous product made of a resin having the same main component as the resin constituting the tape-shaped molded article at both ends parallel to or close to the longitudinal direction of the molded article. Synthetic resin tape-shaped molded article. The synthetic resin tape-shaped molded article according to claim 1, wherein the fibrous material is monofilament. The synthetic resin tape-shaped molded article according to claim 1 or 2, wherein the longitudinal tensile strength is 250 MPa or more and the heat shrinkage is 1% or less. A synthetic resin tape-shaped injection molded article, which is located at both ends parallel to or near the longitudinal direction of the tape-shaped molded article, and the pre-stretched fibrous articles made of a resin having the same principal component as the resin constituting the tape-shaped molded article, and a straight line at equal intervals. A ball chain belt comprising a ball insertion hole provided in a shape. A synthetic resin tape-shaped injection molded article, which is located at both ends parallel to or near the longitudinal direction of the tape-shaped molded article, and the pre-stretched fibrous articles made of a resin having the same principal component as the resin constituting the tape-shaped molded article, and a straight line at equal intervals. A ball chain belt comprising a ball insertion hole provided in a shape and a retaining portion around the ball insertion hole. The ball chain belt according to claim 4 or 5, wherein the fibrous material is monofilament. The ball chain belt according to claim 4 or 5, wherein the tensile strength is 100 MPa or more and the heat shrinkage is 1% or less. In a mold, a molding ball having a diameter slightly larger than a ball held in a straight line in the center of the molding, and a fibrous material of a pre-stretched thermoplastic resin are embedded at both ends parallel to or close to the longitudinal direction of the molding. A method of manufacturing a belt for a ball chain, comprising: molding and molding a resin having the same main component as that of the stretched fiber, thereby integrally molding the tape-shaped portion and the holding portion, and then removing the molding ball. The method of manufacturing a ball chain belt according to claim 8, wherein the fibrous material is monofilament.

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